Code:
inux:/home/xxx # setserial /dev/ttyS0 uart none
Cannot set serial info: Device or resource busy
linux:/home/xxx # modprobe lirc_serial
FATAL: Error inserting lirc_serial (/lib/modules/2.6.11.4-21.7-default/kernel/drivers/char/lirc/lirc_serial.ko): Unknown symbol in module, or unknown parameter (see dmesg)
linux:/home/xxx #